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zone system test with filter on lens?



 
 
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  #1  
Old May 17th 04, 07:44 PM
Phil Lamerton
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Default zone system test with filter on lens?

I'd like to photograph a gray card outside on an overcast day, in
order to do some zone system testing with my new camera and lenses.

Since I will eventually be using the camera in the portrait studio
with a yellow/green filter, would it be wrong to do the testing with
the filter over the lens?

Thanks in advance for your advice on this.

phil lamerton
  #2  
Old May 17th 04, 07:52 PM
Nick Zentena
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Default zone system test with filter on lens?

Phil Lamerton wrote:
I'd like to photograph a gray card outside on an overcast day, in
order to do some zone system testing with my new camera and lenses.

Since I will eventually be using the camera in the portrait studio
with a yellow/green filter, would it be wrong to do the testing with
the filter over the lens?



Are you doing a film speed test? If you intend to use the filter nothing
wrong with testing with the filter on. It'll give you a more accurate result.

Nick
  #3  
Old May 18th 04, 12:15 AM
Gregory W Blank
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Default zone system test with filter on lens?

In article ,
Nick Zentena wrote:

Phil Lamerton wrote:
I'd like to photograph a gray card outside on an overcast day, in
order to do some zone system testing with my new camera and lenses.

Since I will eventually be using the camera in the portrait studio
with a yellow/green filter, would it be wrong to do the testing with
the filter over the lens?



Are you doing a film speed test? If you intend to use the filter nothing
wrong with testing with the filter on. It'll give you a more accurate result.

Nick


I agree,....its the best method for absolute testing.
--
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http://members.verizon.net/~gregoryblank

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  #4  
Old May 18th 04, 01:08 AM
CWal871581
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Default zone system test with filter on lens?

Phil Lamerton wrote:
I'd like to photograph a gray card outside on an overcast day, in
order to do some zone system testing with my new camera and lenses.

Since I will eventually be using the camera in the portrait studio
with a yellow/green filter, would it be wrong to do the testing with
the filter over the lens?


Are you doing a film speed test? If you intend to use the filter nothing
wrong with testing with the filter on. It'll give you a more accurate

result.

Nick


I agree,....its the best method for absolute testing.
A

HREF="http://members.verizon.net/~gregoryblank"http://members.verizon.net
/~gregoryblank/A


If the yellow filter was put on and zones I to X were shot (at the EI
determined
by a no filter test), and then the film was processed using what the no filter
test determined to be the correct time and agitation, what is the predicted
change in the density in the shots that used the filter?

TIA,
Curtis
  #6  
Old May 18th 04, 02:53 AM
Randy Stewart
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Default zone system test with filter on lens?


"Phil Lamerton" wrote in message
om...
I'd like to photograph a gray card outside on an overcast day, in
order to do some zone system testing with my new camera and lenses.

Since I will eventually be using the camera in the portrait studio
with a yellow/green filter, would it be wrong to do the testing with
the filter over the lens?


At the risk of incurring the rath of the previous responders, No, what you
propose is not a good idea.

The basic idea of testing the film speed, zone testing, etc, with the filter
in place is fine.

Doing the testing in overcast daylight where the planned use is in studio,
under tungsten or electronic flash, is a bad idea because the color
temperature of overcast daylight is much higher than anything you will use
in the studio. The studio response of the film/filter combination will be
quite different than your testing experioence, rendering the point of your
testing largely irrelevant.


  #7  
Old May 18th 04, 12:17 PM
Gregory W Blank
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Default zone system test with filter on lens?

In article ,
"Randy Stewart" wrote:

At the risk of incurring the rath of the previous responders, No, what you
propose is not a good idea.

The basic idea of testing the film speed, zone testing, etc, with the filter
in place is fine.

Doing the testing in overcast daylight where the planned use is in studio,
under tungsten or electronic flash, is a bad idea because the color
temperature of overcast daylight is much higher than anything you will use
in the studio. The studio response of the film/filter combination will be
quite different than your testing experioence, rendering the point of your
testing largely irrelevant.


Actually your correct and that should have been noted by the rest of us.

& to the O.P.

In order to obtain accurate results you have to test the film under the same
conditions you wish to use it.
--
Baltimore & DC Large Format User Website

http://members.verizon.net/~gregoryblank

For best results expand this window at least 6" at 1152 x 768 resolution
  #9  
Old May 18th 04, 03:18 PM
Phil Lamerton
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Posts: n/a
Default zone system test with filter on lens?

At the risk of incurring the rath of the previous responders, No, what you
propose is not a good idea.

The basic idea of testing the film speed, zone testing, etc, with the filter
in place is fine.

Doing the testing in overcast daylight where the planned use is in studio,
under tungsten or electronic flash, is a bad idea because the color
temperature of overcast daylight is much higher than anything you will use
in the studio. The studio response of the film/filter combination will be
quite different than your testing experioence, rendering the point of your
testing largely irrelevant.


Thanks for this info. Please could you explain a bit more?

If I calculate the film speed and development time for N using my
outdoor results, will the difference indoors with electronic flash (or
tungsten) be so significantly different that the results will be
unusable, given that contrast can be controlled in the studio?

By how much would the color temperature outside differ from my
electronic flash, and by how much do you think it would throw out the
speed test & development time results on black & white film?

I suppose I could light the gray card indoors with an electronic
flash. Will it not matter that I shall subsequently use varied
lighting set-ups (and number of lights).

TIA

regards, phil lamerton
  #10  
Old May 18th 04, 05:27 PM
Severi Salminen
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Default zone system test with filter on lens?

Michael Scarpitti wrote:

Since I will eventually be using the camera in the portrait studio
with a yellow/green filter, would it be wrong to do the testing with
the filter over the lens?


What 'camera and lenses'?


How would it affect your answer if you knew the camera and lens in
question? Most filters work quite similarly no matter what camera or lens...
 




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